Tire-protective rivet.



' E. B. STIMPSON.

TIRE PROTECTIVE RIVET.

APPLICATION IIL'ED JAN. 28, 1908.

925,052. Patented June15,1909.

, g Wmzm 8 l1 1 35%,61H0m1 4 i T alliivhom it. may .concem'k rivetwithin my inv'ention;;,Fig. 2is a top already described inhavmg first, anon-1nber 1, a shank-2, and a concavo-convex memto start with awasher-like disk such as in in Tire-Protective Rivets, OfWlIIClI thefollowing 1s a specification...-

show a bl'ank'in twostagesin a PATENT OFFICE.-

EDWIX BA LL STIMPSONfOF BROOKLYN, NEW YORK ASSIGNOR TO EDWIN BiSTI'MPSON i COMPANYfA CORPORATION OF NEW YORK.

l Be'it known that 11 EDWIN- BALL Srrarrl soX, a citizen of the UnitedStates, and a i resident of the borough of Brooklyn, county" of Kings,and State of.-Xew York, have invented certain new and useful Imrovements .The objectof therif et ofmy present in vention-is toprovidein advantageous form a rivet adapted to, protectautomobile tires and thelike from wear andat thesame time preventfslipping andfskidding. I p

In the drawings which show some of the forms whichmyrivet ma'ytake,Figure 1 is a vertical mid-section partly in elevation of a planviewofthe rivetofFig. 1; Figs. 3 and 41 referred method of forming onemember of t e rivet; Fig. 5 is a perspective view of a modified I formof rivet as same would appear if out in two parts by a verticalmid-section, portions being shown in elevation; and Fig.6 is a per.spective view of a modification of one member of the rivet as same wouldappear cut in two parts by a verticalimid-section.

Describing now my invention with particular reference to the forms ofrivets shown in the drawings and reserving it to the claims to point outthe novel features, the rivet of Fig. 1 is seen to comprise a cup orbase memher 3. In this particular form the shank is integral with thebase member. Also it will be noted that the concavo-convex member islocated in the cup with its convexity outward and that it is secured insuch position by the infolding of the cup against its outside. Theresult of the construction is a rivet having a head and a shank whereinthe head is hollow. The top of the head has an opening 4 through it,thereby providing especially effective uoad-biting edges to preventslipping and skidding. This 0 ening is through the concavoconvex mem er;and said member will ordinarily be of hardened steel.

The concavo-convex member and the opening therethrough may be formed ina number of ways, but the preferred method is Fig. This is then given adome-like form as in Fig. 4. This method is preferred over 1 startinwith a dome and thereafterboring a j verticaT walled opening through itstop, since J 5; Specification of Letters Patent. M appl i caition filed.January 28,

'double advantage, first, of being more e Patented June 15, 1909.

190a; Seria1'No.412,971.

so effectively in gripping the roadas the pre ferred method, wherebyreferring to Fig. 4 it will be noted that the edges of the openingthrough the concavo-convex member are presented at an angle to the roadand havin the ive initially than the same opening with ver- "tical wallsand secondly, of wearing off more suitably as the rivet is used.

'While the method'as described in connection with Figs. 3 and 4 offorming the concavo-convex member and its 0 ening is preferred as givingsuperior resu ts,,nevertheless it is not to be considered as necessarilyessential to the practice of the invention.

The rivet shown in Fig. 5 differs from that tegral shank 2, and second,in having an additional member 7 interposed between the shank and theconcave-convex member. Thus it will be notedthat the cup or, base member1 of Fig. 5 has an opening through its bottom andthat the shankmembeinprol'ects from said opening and is headed at 8 to be too large topass completely through it; thata member 7 which may take a variety offorms is located in the cup before the latter is inturnedagainst theconcavo-convex member; and that the particular form shown of this member7 is a solid pyramid or cone of a size adapted to have its ase bearagainst the headed portion 8 of the shank-member while its pointprojects through the opening in the concavo-convox member, between whichmember and the headed portion of the shank said member 7 is confined.

The result of. the construction is thatthe shankmember is supported fromwithin to hold its shank in projecting position from the hollowrivet-head, whereby the free-end of the shank can be convenientlyriveted,

The projecting point of the member 7 engages the road through theopening in the concavo-convex member. .After the point has worn off andthe opening itself has-worn to a larger diameter, the member 7 will notdrop out, at least not until the opening shall have become worn verylarge but will move loosely about in the hollow of the rivet head andpresent various points and edges of itself through the opening in theconcavoconvex member which, cooperating with the edges of said opening,will assist in preventing slipping and skidding.

i I the latter does not present road biting edges I lfect- I shape ofthe rivet head.

i In 6 a modification of the concaveconvex member is shown in which informing the opening therethrough, instead of completely punching out thematerial, it is slitted to form points 9 which are bent outwardly toform road-contacting'pro'ections at the periphery-of the opening. T

under icy conditions,vand may be used as a substitute for theconcavo-convex member either in Fig. '1, or in Fig. 4.

f The expression "box-like usedin some of the claims is intended tobring out the idea'that the head of the rivet, so specified,

is'substantially-inclosed like a box or a rece tacle, but thisexpression is not to be ta en as implying anything as to the recise notto be implied that the head is rectangular, or otherwise. As a matter offact, the rivet head inJhe preferred form shown has considerableresemblance to aflattened hollow ball.

Having thus described my invention, what I claim 15-;

1. A protective rivet comprisinga shank and a hollow boxelike head; thehead having a rigid base and a concavo-convex upper portion springingfromthebase with its con-, vexity upward and having an opening throughits top, the rim of which contacts a with t e road, and the shankpro'ec'ting from the bottom of said hollow box-1i e head and having nocontact with the concave-convex portion of the head. I

form of concavo convex memberv is especially efiective.

or examp e, it is 3. A protective-rivet comprising a hollow i headhaving an opening through its b0. sin;

a shank promoting from said opening, having a'heade portion, too largeto pass through it; and a member located in the hollow head andextending between the top of said member and the headed portion of theshank.

4. Aprotective-rivet comprising a hollow head consisting of a base and aconcaveconvex member securedwith its convexity outward upon the base,said base and concavo-convex member each having. a. 1 o eningtherethrough; a shank projecting rom the opening through the base andhaving a headed portion too large /to pass therethrough; and a member lnthe hollowhoadj extendin between the concavo-convox meniher and t eheaded portion of the she 11k and having a projection extending throughthe opening in the concavo-convex member.

In witness whereof, I have signed my name to the foregoing specificationin the presence of two subsoriblng witnesses.

I EDWIN BALL STIMPSON. Witnesses:

Jos. F. OBRIEN,

W. SoHERR, Jr.

